Granted Patent
Utility
US 4,780,886 · App. 06/874,912
Device for detecting a data signal energy drop
Inventor:
Francis Maddens
Patented Case
View Patent ↗
Granted: Oct 25, 1988
Filed: Jun 16, 1986
Inventor
Francis Maddens
Assignee (at issue)
International Business Machines Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.